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// Portions Copyright [2019] Payara Foundation and/or affiliates

package com.sun.ejb.base.stats;

import com.sun.ejb.containers.EjbContainerUtilImpl;
import com.sun.enterprise.admin.monitor.stats.GenericStatsImpl;
import org.glassfish.j2ee.statistics.BoundedRangeStatistic;
import org.glassfish.j2ee.statistics.CountStatistic;
import org.glassfish.j2ee.statistics.Statistic;
import org.glassfish.j2ee.statistics.Stats;

import java.util.logging.Logger;

/**
 * Base class for all the StatsImpl. Also provides a couple
 *  of methods for MonitorListener
 *
 * @author Mahesh Kannan
 */


public abstract class StatsImpl
    implements Stats
{
    protected static final Logger _logger = EjbContainerUtilImpl.getLogger();

    private GenericStatsImpl	    genericStatsDelegate;

    protected StatsImpl() {
    }

    protected void initialize(String statInterfaceName) {
	try {
	    genericStatsDelegate =  new GenericStatsImpl(statInterfaceName, this);
	} catch(ClassNotFoundException cnfEx) {
	    throw new RuntimeException(statInterfaceName + " not found", cnfEx);
	}
    }

    public Statistic getStatistic(String statName) {
	return genericStatsDelegate.getStatistic(statName);
    }

    public String[] getStatisticNames() {
	return genericStatsDelegate.getStatisticNames();
    }

    public Statistic[] getStatistics() {
	return genericStatsDelegate.getStatistics();
    }

    public String statToString() {
	StringBuilder sbuf = new StringBuilder();
	Statistic[] stats = getStatistics();
	int sz = stats.length;
	for (int i=0; i<sz; i++) {
	    if (stats[i] instanceof CountStatistic) {
		CountStatistic stat = (CountStatistic) stats[i];
		sbuf.append(stat.getName()).append("=")
		    .append(stat.getCount()).append("; ");
	    } else if (stats[i]  instanceof BoundedRangeStatistic) {
		BoundedRangeStatistic stat = (BoundedRangeStatistic) stats[i];
		sbuf.append(stat.getName()).append("=")
		    .append(stat.getCurrent()).append("; ");
	    } else {
		sbuf.append(stats[i].getName()).append("=?");
	    }
	}

	return sbuf.toString();
    }

}
